diff --git a/nest/iface.h b/nest/iface.h
index 379f566c..94c0945b 100644
--- a/nest/iface.h
+++ b/nest/iface.h
@@ -114,6 +114,12 @@ typedef struct neighbor {
  */
 neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
 
+static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
+{
+  neighbor *n = neigh_find(p, a, 0);
+  return n && n->iface == i;
+}
+
 void neigh_dump(neighbor *);
 void neigh_dump_all(void);
 void neigh_prune(void);
@@ -121,8 +127,6 @@ void neigh_if_up(struct iface *);
 void neigh_if_down(struct iface *);
 void neigh_init(struct pool *);
 
-extern int if_connected(ip_addr *a, struct iface *i); /* -1=error, 1=match, 0=no match */
-
 /*
  *	Interface Pattern Lists
  */
diff --git a/nest/neighbor.c b/nest/neighbor.c
index 5750f8cf..c4328b6c 100644
--- a/nest/neighbor.c
+++ b/nest/neighbor.c
@@ -24,7 +24,7 @@ neigh_hash(struct proto *p, ip_addr *a)
   return (p->hash_key ^ ipa_hash(*a)) & (NEIGH_HASH_SIZE-1);
 }
 
-int
+static int
 if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
 {
   struct ifa *b;